﻿using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Windows.Forms;
using System.Security.Cryptography;//这个是处理文字编码的前提
using System.IO;
using System.Runtime.Serialization;


namespace Secret
{
    
    public partial class Form1 : Form
    {
        
        private static byte[] Keys = { 0x12, 0x34, 0x56, 0x78, 0x90, 0xAB, 0xCD, 0xEF };
        string encryptString;
        string encode;
        string decode;
        string miyue;
        public Form1()
        {
            InitializeComponent();
        }

        private void jiami_Click(object sender, EventArgs e)
        {
            encryptString = textBox1.Text;

            byte[] byte_tmp = Encoding.Default.GetBytes(encryptString);
            string str_tmp = Encoding.Default.GetString(byte_tmp);
            
            if (textBox3.Text.Length != 8)
            {
                MessageBox.Show("密钥长度不为8，请重新输入",
                                "警告",
                                MessageBoxButtons.OK,
                                MessageBoxIcon.Warning);
                textBox3.Focus();
            }
            else
                miyue = textBox3.Text;

            encode = EncryptDES(str_tmp, textBox3.Text);
            textBox2.Text = (encode);
           // MessageBox.Show(encode);
        }

        private void jiemi_Click(object sender, EventArgs e)
        {
            //MessageBox.Show(FormsAuthentication.HashPasswordForStoringInConfigFile("vbd", "SHA1"));
            byte[] byte_tmp = Encoding.Default.GetBytes(textBox2.Text);
            string str_tmp = Encoding.Default.GetString(byte_tmp);

            if (textBox3.Text.Length != 8)
            {
                MessageBox.Show("密钥长度不为8，请重新输入",
                                "警告",
                                MessageBoxButtons.OK,
                                MessageBoxIcon.Warning);
                textBox3.Focus();
            }
            else
                miyue = textBox3.Text;

            decode = DecryptDES(str_tmp, textBox3.Text);
            textBox4.Text = (decode);
        }
        /// <summary> 
        /// DES加密字符串 
        /// </summary> 
        /// <param name="encryptString">待加密的字符串</param> 
        /// <param name="encryptKey">加密密钥,要求为8位</param> 
        /// <returns>加密成功返回加密后的字符串，失败返回源串</returns> 
        public static string EncryptDES(string encryptString, string encryptKey)
        {
            try
            {
                byte[] rgbKey = Encoding.UTF8.GetBytes(encryptKey.Substring(0, 8));
                byte[] rgbIV = Keys;
                byte[] inputByteArray = Encoding.UTF8.GetBytes(encryptString);
                DESCryptoServiceProvider dCSP = new DESCryptoServiceProvider();
                MemoryStream mStream = new MemoryStream();
                CryptoStream cStream = new CryptoStream(mStream, dCSP.CreateEncryptor(rgbKey, rgbIV), CryptoStreamMode.Write);
                cStream.Write(inputByteArray, 0, inputByteArray.Length);
                cStream.FlushFinalBlock();
                return Convert.ToBase64String(mStream.ToArray());
            }
            catch
            {
                return encryptString;
            }
        }
        /// <summary> 
        /// DES解密字符串 
        /// </summary> 
        /// <param name="decryptString">待解密的字符串</param> 
        /// <param name="decryptKey">解密密钥,要求为8位,和加密密钥相同</param> 
        /// <returns>解密成功返回解密后的字符串，失败返源串</returns> 
        public static string DecryptDES(string decryptString, string decryptKey)
        {
            try
            {
                byte[] rgbKey = Encoding.UTF8.GetBytes(decryptKey);
                byte[] rgbIV = Keys;
                byte[] inputByteArray = Convert.FromBase64String(decryptString);
                DESCryptoServiceProvider DCSP = new DESCryptoServiceProvider();
                MemoryStream mStream = new MemoryStream();
                CryptoStream cStream = new CryptoStream(mStream, DCSP.CreateDecryptor(rgbKey, rgbIV), CryptoStreamMode.Write);
                cStream.Write(inputByteArray, 0, inputByteArray.Length);
                cStream.FlushFinalBlock();
                return Encoding.UTF8.GetString(mStream.ToArray());
            }
            catch
            {
                return decryptString;
            }
        }


    }
}





